Method of generating oscillations



Feb. 1 7, 1931.

G. THxLo METHOD 0F GENERATING OSCILLATIONS Filed Feb. 9, 1926 lnUenTOrBY GunherThilo- VMM homeY Patented Feb. 17, 1931 UNITED STATES PATENTOFFICE GNTHER THILO, F FRIEDENAU, NEAR BERLIN, GERMANY, ASSIGNOR T0ERICH F. HUTH G. M. B. H., OF BERLIN, GER-MANY METHOD OF GENERATINGOSCILLATIONS Application led February 9, 1926, Serial No. 87,195, and inGermany February 19, 1925.

The present invention relates to circuit arrangements for the productionof oscillations and more specifically to such arrangements which includean oscillating crystal.

It has heretofore been known to produce regenerative oscillations byutilizing a crystal detector, battery and resistors. A detaileddescription of the physical phenomena and operation of oscillatingcrystals is set forth, among others, in a number of articles appearingsuccessively in the Vireless Vorld of October l issue, page 2, October.8th issue, page 47 and October 22nd issue, page 93, lof 1924. In suchcircuit arrangements the establishment of the oscillations is controlledby adjusting either the battery voltage or the value of the resistor orboth. This presents practical difficulties in such arrangements as itoften affords a longer time and special skill to adjust such a crystalso as to produce oscillations.

In accordance with the present invention, the crystal is placed in agaseous atmosphere. It has been found by experiment that various l5gases act differently upon the generation of oscillations. Some of thegases used do not show any effect whatever as compared with using thecrystal exposed to the air. Argon n is one of the gases which does notaffect the "O generation of oscillations.

On the other hand, it has been found that certain gases will suppressthe oscillations. Hydrogen, illuminating. gases, alcohol va- .,l. pors,and carbonic acid are among those gases "J which have been found torestrict the oscillations.

In acordance with the present invention it is proposed to place thecrystal in a container and to admit a stream of gas selected to producethe desired oscillation.

It has been found that by regulating the gas in any well known mannerthat the oscillations are positively controlled especially in the casewhen conditions are maintained at the limit of the oscillating point ofthe crystal.

My invention is illustrated in the accompanying drawing which showsdiagrammatically the crystal in an electric circuit. In to the drawing Krepresents the crystal arranged to operate as an oscillator, Edesignates a source of potential, such as a battery connected in circuitwith the crystal, R1 indicates a regulating impedance which may also bean inductance indicated by dotted lines L1, and G designates a vesselcontaining the gas heretofore described. The vessel is apertured at eachend and is provided with insulated bushings O extending into each endthereof. The oscillating circuit which connects with the crystal Kincludes a variable condenser E and inductance L and a resistance R.Oscillations may be established and sustained in the crystal circuit. ci

The operation of such a device, in accordance with my invention is asfollows z-Referring to the drawing and assuming that the crystal hasbeen adjusted to produce oscillations, the introduction of a gas actingto sup- 7e press such oscillations, for instance, by opening an inletvalve V, will stop the oscillations and conversely.v the removal of thegas by opening the valve, will start the oscillations again. 7:-,

Modifications may be made in the arrangement, location and constructionof parts within the spirit and scope of my invention and suchmodifications are intended to be covered by the appended claims. g1)

I claim 1. The method of starting and stopping the oscillations in anelectrical circuit including a crystal in an enclosure for containinggaseous atmosphere, which consists in admit* e.; ting and exhausting thegas in the crystal inclosure.

2. The method of controlling the oscillations in an electrical circuitincluding a crystal in an enclosure for containing a gaseous w3atmosphere, Which consists in admitting gas to the enclosure to stoposcillations and exhausting the gas therefrom to start the oscillations.

3. In an electrical apparatus an oscillating crystal, a container forsaid crystal containing a gas and means to admit and eXhau-st the gasfor stopping and starting oscillations.

4. An electrical apparatus comprising an l@ oscillating crystal and acontainer for enclosing said crystal, a gaseous atmosphere of hydrogenWithin said container and surrounding said crystal, and means to Varythe pressure of said atmosphere. l

3;, In testimony whereof I afx my signature.

GNTHER THILO.

